These are done for various purposes, often either for preservation, recreation, or performance. Groups that dance for different purposes tend to launder dances other than, & to choose different dances. Unpaid dancers like dances of limited complexness, & tend to vary a dances (typically accidentally) based on data from their have tastes. Performing artist generally like striking, flamboyant, or even athletic dances, & it typically tend to dance by having conventionalized techniques & exaggerated movements.

History
Traditional dances such as branles, the polka, et al., have been done internationally for hundreds of years. International folk dancing has at least 2 supplementary specific identifying features. 1st, a dances come often considered to become primarily a products of national traditions rather than a property of an international tradition. 2nd, dances differently folk dancing tend mostly to become excluded.

A creation of international folk dancing intrinsically is typically attributed to Vytautas Beliajus, a Lithuanian-American world health organization exposed, taught, & performed dances from either various ethnic traditions in the 1930s. More large teachers & promoters of international folk dancing within its 1st couple of decades involved Michael and Mary Ann Herman, Jane Farwell, and Dick Crum.

External hyperlink: http://www.phantomranch.net/folkdanc/folkdanc.htm